Abstract：
INTRODUCTION:Functional appliances lead, in different degrees, to loss of anchorage in the lower arch. By anchoring them to the mandibular bone, any dental side effects may be avoided and the skeletal effect enhanced. Stability of bone-borne fixation would be affected by forces created by the pull of the masticatory muscles. We aimed to identify mean maximum forces produced by mandibular retrusive muscles, at different degrees of advancement. SUBJECTS AND METHODS:Eighteen healthy adult volunteers participated in the study. Maximum retrusive force was measured using a splint/load cell system. Readings of the maximum forces of retrusion were taken from five mandibular positions: unstrained retruded position, and 4, 5, 6, and 7 mm anterior to the unstrained position. Data were presented as means ± SD and anova was performed to examine statistical significant differences between means of the maximum retrusion force. RESULTS:Mean maximum retrusion force ranged between 63.3 and 198.2 newtons at the unstrained and 7 mm positions, respectively. It increased as the distance of advancement increased, being statistically significantly (p < 0.05) less at unstrained position compared with all advancement distances, 4 mm of advancement than 6 and 7 mm advancement, 5 mm of advancement than at 7 mm advancement. CONCLUSION:Magnitude of the forces exerted by muscles during voluntary maximum retrusion movement from different advancement positions increased proportionately as the retrusion distance increased up to 7 mm. Such range of high forces might be important to consider when designing a bone-borne functional appliance.
journal_name
Orthod Craniofac Resjournal_title
Orthodontics & craniofacial researchauthors
Al-kalaly AA,Dyson JE,Wong RW,Schätzle M,Cheung LK,Rabie ABdoi
10.1111/ocr.12004subject
Has Abstractpub_date
2013-02-01 00:00:00pages
56-64issue
1eissn
1601-6335issn
1601-6343journal_volume
16pub_type
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journal_title：Orthodontics & craniofacial research
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pub_type： 杂志文章,meta分析,评审
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更新日期：2015-08-01 00:00:00
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